linux-hardening - Re: [PATCH v3] scsi: csiostor: Use kcalloc() instead of kzalloc()

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Date: Mon, 29 Apr 2024 10:20:15 -0700
From: Kees Cook <keescook@...omium.org>
To: Erick Archer <erick.archer@...look.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3] scsi: csiostor: Use kcalloc() instead of kzalloc()

On Sat, Mar 30, 2024 at 05:17:53PM +0100, Erick Archer wrote:
> Use 2-factor multiplication argument form kcalloc() instead
> of kzalloc().
> 
> Also, it is preferred to use sizeof(*pointer) instead of
> sizeof(type) due to the type of the variable can change and
> one needs not change the former (unlike the latter).
> 
> Link: https://github.com/KSPP/linux/issues/162
> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> Signed-off-by: Erick Archer <erick.archer@...look.com>
> ---
> Changes in v2:
> - Update the changelog text describing the sizeof()
>   changes (Gustavo A. R. Silva)
> 
> Changes in v3:
> - Add the "Reviewed-by:" tag.
> - Rebase against linux-next.
> 
> Version 1:
> Link: https://lore.kernel.org/linux-hardening/20240112182603.11048-1-erick.archer@gmx.com/
> 
> Version 2:
> Link: https://lore.kernel.org/linux-hardening/20240114102400.3816-1-erick.archer@gmx.com/
> 
> Hi everyone,
> 
> This patch seems to be lost. Gustavo reviewed it on January 15, 2024
> but the patch has not been applied since.

This looks correct to me. I can pick this up if no one else snags it?

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> 
> Thanks,
> Erick
> ---
>  drivers/scsi/csiostor/csio_init.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
> index d649b7a2a879..d72892e44fd1 100644
> --- a/drivers/scsi/csiostor/csio_init.c
> +++ b/drivers/scsi/csiostor/csio_init.c
> @@ -698,8 +698,7 @@ csio_lnodes_block_request(struct csio_hw *hw)
>  	struct csio_lnode **lnode_list;
>  	int cur_cnt = 0, ii;
>  
> -	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
> -			GFP_KERNEL);
> +	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
>  	if (!lnode_list) {
>  		csio_err(hw, "Failed to allocate lnodes_list");
>  		return;
> @@ -737,8 +736,7 @@ csio_lnodes_unblock_request(struct csio_hw *hw)
>  	struct csio_lnode **lnode_list;
>  	int cur_cnt = 0, ii;
>  
> -	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
> -			GFP_KERNEL);
> +	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
>  	if (!lnode_list) {
>  		csio_err(hw, "Failed to allocate lnodes_list");
>  		return;
> @@ -775,8 +773,7 @@ csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
>  	struct csio_lnode **lnode_list;
>  	int cur_cnt = 0, ii;
>  
> -	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
> -			GFP_KERNEL);
> +	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
>  	if (!lnode_list) {
>  		csio_err(hw, "Failed to allocate lnodes_list");
>  		return;
> @@ -816,8 +813,7 @@ csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
>  	struct csio_lnode **lnode_list;
>  	int cur_cnt = 0, ii;
>  
> -	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
> -			GFP_KERNEL);
> +	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
>  	if (!lnode_list) {
>  		csio_err(hw, "Failed to allocate lnodes_list");
>  		return;
> @@ -855,8 +851,7 @@ csio_lnodes_exit(struct csio_hw *hw, bool npiv)
>  	struct csio_lnode **lnode_list;
>  	int cur_cnt = 0, ii;
>  
> -	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
> -			GFP_KERNEL);
> +	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
>  	if (!lnode_list) {
>  		csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
>  		return;
> -- 
> 2.25.1
> 

-- 
Kees Cook